The Bullymong isn’t very far from the lodge in Hunter’s Grotto. Head out the front door in the direction of the Bounty Board. Getting to the lair of the Bullymong will be a lot faster if you head down the path and pick yourself up shiny new Fan Boat.

After picking out the Fan Boat of your liking, head out in the direction of the open water. Of course you can’t go too far otherwise the giant turrets will take you out. Instead, follow the coastline past the Savage settlement and near the structure in the water near the back of the mountain. Here you will see another Catch-A-Boat station and a blockade of bones that only allows you to continue on foot.

Hop out of the Fan Boat, assuming you’re in one and you’ll have surely noticed the Bullymong that have been spat out of the mountain side. Eliminate them if you wish otherwise they’ll just follow you and add to the slew of Bullymongs you’re about to face.

Continue past the barrier of bones that block your Fan Boat from going through and make your way up the hill. When you reach the top, you’ll come across a dead end with bones everywhere and Bullymong holes in the mountain. Get close enough and the Bullymongs will start pouring out.

You’ll have to kill a few before the bulletproof beast shows it face. When it does, it will reveal itself as Bulwark. This Bullymong is all but bulletproof, unless you’re too close to him. If you stay too near Bulwark, he will stop attacking and immediately cover himself with a solid rock shield that you are unable to inhibit. Back away and he will come out of hiding, allowing you to take your shots. Be mindful of the projectiles and the other Bullymongs that spawn around while the fight goes on.